If you’re wondering what UDP port is used for IKE traffic from VPN clients to servers, you’re in the right place. Keep reading to find out.
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Introduction
The UDP port used for IKE traffic from the VPN client to the VPN server is 500.
The Three Main Components of an IKE-Based VPN
IKE uses a three-way handshake to authenticate the identities of the two hosts attempting to connect and to generate shared session keys. This process consists of three main components:
1. IKE phase one— In this phase, the two hosts exchange authentication information and negotiate an IKE security association (SA). An SA is a set of security parameters that defines how the IKE handshake will be conducted.
2. IKE phase two— In this phase, the two hosts generate shared session keys that will be used to encrypt and decrypt all traffic exchanged during the VPN session.
3. IKE phase three— In this final phase, the two hosts exchange information about their IPSec configurations and verify that they are compatible. If everything is compatible, the VPN connection is established and traffic can begin flowing between the two sites.
The IKE Protocol
The Internet Key Exchange (IKE) is the protocol used to set up a security association (SA) in the IPsec protocol suite. IKE uses a peer-to-peer architecture. In phase 1, IKE builds upon the Oakley and SKEME key exchange protocols to establish a mutually authenticated ISAKMP security association. In phase 2, IKE negotiates an IPsec SA using the Quick Mode exchange.
IKE traffic is typically sent over UDP port 500.
The UDP Port Used for IKE Traffic
IKE uses UDP port 500 for traffic from the VPN client to the server.
Conclusion
After doing some research, we have found that the UDP port used for IKE traffic from VPN client to server is 500.